Abstract

The Advanced Earth Observation Satellite (ADEOS), launched in
the summer of 1996, has a high-resolution infrared Fourier transform
spectrometer, with the interferometric monitor for greenhouse gases
(IMG) onboard. The IMG has a high spectral resolution of 0.1
cm-1 for the purpose of retrieving greenhouse gas profile
maps of the Earth. To meet the requirements of the retrieval
algorithms for greenhouse gas profiles, atmospheric emission spectra
must be calibrated to better than 1 K accuracy. Prior to the launch
of the ADEOS with the IMG, we developed an airborne simulator called
the tropospheric infrared interferometric sounder (TIIS). We
explain the calibration procedure for the TIIS, which determines the
points with the same optical path difference on interferograms for
complex Fourier transformation, using the retained phase term on the
calibrated spectrum. The downward atmospheric radiation, measured
with the TIIS, was well calibrated using this
algorithm. Furthermore, calibration of the spectra obtained from
the IMG initial checkout mission observation was carried
out.

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